*.
f|!
f
m
I
528
Tension of Belts.
make a constant angle with the radii, and if the angles cr are taken
small, the construction is fairly correct. But greater accuracy is
secured by using the equation to the curve,
T
where e = 2718, the base of Napieran logarithms.
More usefully the formula becomes
L0,@
/ (See Appendix //.,
•«43 M- /867.)
Then, the log. being known, the corresponding number is
found from a table, and the formula used for any value of
-, even beyond 360°.
COEFFICIENT OF FRICTION (/*) IN TENSION ELEMENTS.
Leather belting" on iron pullies .........
"\ to *A
i "5 if oily
• Wire rope or^iron pullies ...............
'is
'Wire rope 0n leather-bottomed pullies Hemp rope on jbron pullies ....... .....
•25 '28 to *i8
) not accounting > for wedge \ action